CafePress Think Like A Proton Stay Positive Cotton T-Shirt Black These quality short-sleeve crew-neck t-shirts are 100% pre-shrunk cotton (cotton/polyester blend for gray colors) and are soft and durable for a comfortable feel. Fit is unisex standard (size up in doubt). S, M, L, XL, XLT, 2XL, 2XLT, 3XL, 3XLT available. Our graphic tee designs are professionally printed, so your unique design will look great and make someone smile with the funny, cute, vintage, or expressive artwork. Treat yourself, or make this t shirt the perfect gift for Mother's Day, Father's Day, Valentine's Day, Christmas, birthdays, anniversaries, retirement, or for no reason at all! Machine wash cold inside out with like colors and tumble dry low for easy and convenient care. IMPORTED. We offer 100% money back guarantee, so you can buy with confidence. Your satisfaction is our promise, and returns/exchanges are made easy.